Posted by Bob M on February 21, 2013 at 20:18:01 from (220.127.116.11):
In Reply to: Cutting oil posted by Harvey 2 on February 21, 2013 at 16:38:03:
Someone's feeding you bunk...
It's the CARBON CONTENT of the steel and RATE OF COOLING that determines steel's final hardness after heat treatment.
As for quench cooling rates, brine (salt water) cools fastest. This is followed by plain water then oil and finally air. But even cooling in oil happens so quickly there's no time for the steel to absorb any carbon. Rather to absorb significant carbon a part must be maintained at very high temperature (1,500+) for several hours in a carbon-rich environment such as a metal cyanide salt bath, carbon monoxide gas, etc.
Incidentally aside from cost there is no advantage quenching in used motor oil vs new. I suspect used oil will likely smoke and smell worse however.
Regarding cutting oils it is extreme pressure and temperature additives that make an oil effective for cutting metal. Years ago these additives were primarily lard and sulfur - thus the distinctive smell inside every tool and die shop. I have no idea what's used in cutting oils today.
Same-Day Shipping! Most of our stocked parts ship the same day you order (M-F). Expedited shipping available, just call! Most prices for parts and manuals are below our competitors. Compare our super low shipping rates! We have the parts you need to repair your tractor. We are a Company you can trust and have generous return policies! Shop Online Today or call our friendly sales staff toll free (800) 853-2651. [ More Info ]
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.